Fix typos

Author: gaurav-arya

src/TestUtils.jl

@@ -140,11 +140,11 @@ function test_fft_backend(ArrayType=Array; test_real=true, test_inplace=true)
                 @test fftdims(P) == dims
             end
 
-            if test_real && (x isa Real) 
+            if test_real && (eltype(x) <: Real) 
                 x_real = float.(x) # for testing in-place real FFTs
                 # RFFT
                 fftw_rfft = selectdim(fftw_fft, first(dims), 1:(size(fftw_fft, first(dims)) ÷ 2 + 1))
-                ry = AbstractFFTs.rfft(x)
+                ry = AbstractFFTs.rfft(x, dims)
                 @test ry ≈ fftw_rfft
                 for P in (plan_rfft(similar(x), dims), inv(plan_irfft(similar(ry), size(x, first(dims)), dims)), 
                           AbstractFFTs.plan_inv(plan_irfft(similar(ry), size(x, first(dims)), dims)))